js/pz2.js

   1 /*
   2 ** $Id: pz2.js,v 1.40 2007-06-25 07:23:56 adam Exp $
   3 ** pz2.js - pazpar2's javascript client library.
   4 */
   5
   6 //since explorer is flawed
   7 if (!window['Node']) {
   8     window.Node = new Object();
   9     Node.ELEMENT_NODE = 1;
  10     Node.ATTRIBUTE_NODE = 2;
  11     Node.TEXT_NODE = 3;
  12     Node.CDATA_SECTION_NODE = 4;
  13     Node.ENTITY_REFERENCE_NODE = 5;
  14     Node.ENTITY_NODE = 6;
  15     Node.PROCESSING_INSTRUCTION_NODE = 7;
  16     Node.COMMENT_NODE = 8;
  17     Node.DOCUMENT_NODE = 9;
  18     Node.DOCUMENT_TYPE_NODE = 10;
  19     Node.DOCUMENT_FRAGMENT_NODE = 11;
  20     Node.NOTATION_NODE = 12;
  21 }
  22
  23 // prevent execution of more than once
  24 if(typeof window.pz2 == "undefined") {
  25 window.undefined = window.undefined;
  26
  27 var pz2 = function(paramArray) {
  28     //for convenience
  29     __myself = this;
  30
  31     //supported pazpar2's protocol version
  32     __myself.suppProtoVer = '1';
  33     __myself.pz2String = paramArray.pazpar2path || "search.pz2";
  34     __myself.stylesheet = paramArray.detailstylesheet || null;
  35     __myself.useSessions = true;
  36     if (paramArray.usesessions != undefined) {
  37          __myself.useSessions = paramArray.usesessions;
  38     }
  39
  40     //load stylesheet if required in async mode
  41     if( __myself.stylesheet ) {
  42         var request = new pzHttpRequest( __myself.stylesheet );
  43         request.get(
  44                 [],
  45                 function ( doc ) {
  46                     __myself.xslDoc = doc;
  47                 }
  48         );
  49     }
  50
  51     // at least one callback required
  52     if ( !paramArray )
  53         throw new Error("An array with parameters has to be suplied when instantiating a class");
  54
  55     __myself.errorHandler = paramArray.errorhandler || null;
  56
  57     // function callbacks
  58     __myself.statCallback = paramArray.onstat || null;
  59     __myself.showCallback = paramArray.onshow || null;
  60     __myself.termlistCallback = paramArray.onterm || null;
  61     __myself.recordCallback = paramArray.onrecord || null;
  62     __myself.bytargetCallback = paramArray.onbytarget || null;
  63     __myself.resetCallback = paramArray.onreset || null;
  64
  65     // termlist keys
  66     __myself.termKeys = paramArray.termlist || "subject";
  67
  68     // some configurational stuff
  69     __myself.keepAlive = 50000;
  70
  71     __myself.sessionID = null;
  72     __myself.initStatusOK = false;
  73     __myself.pingStatusOK = false;
  74     __myself.searchStatusOK = false;
  75
  76     if ( paramArray.keepAlive < __myself.keepAlive )
  77         __myself.keepAlive = paramArray.keepAlive;
  78
  79     // for sorting
  80     __myself.currentSort = "relevance";
  81     // where are we?
  82     __myself.currentStart = 0;
  83     __myself.currentNum = 20;
  84
  85     // last full record retrieved
  86     __myself.currRecID = null;
  87     // current query
  88     __myself.currQuery = null;
  89
  90     //timers
  91     __myself.statTime = paramArray.stattime || 1000;
  92     __myself.statTimer = null;
  93     __myself.termTime = paramArray.termtime || 1000;
  94     __myself.termTimer = null;
  95     __myself.showTime = paramArray.showtime || 1000;
  96     __myself.showTimer = null;
  97     __myself.showFastCount = 4;
  98     __myself.bytargetTime = paramArray.bytargettime || 1000;
  99     __myself.bytargetTimer = null;
 100
 101     // counters for each command and applied delay
 102     __myself.dumpFactor = 500;
 103     __myself.showCounter = 0;
 104     __myself.termCounter = 0;
 105     __myself.statCounter = 0;
 106     __myself.bytargetCounter = 0;
 107
 108     // active clients, updated by stat and show
 109     // might be an issue since bytarget will poll accordingly
 110     __myself.activeClients = 1;
 111
 112     // auto init session?
 113     if (paramArray.autoInit !== false)
 114         __myself.init();
 115 };
 116 pz2.prototype =
 117 {
 118    stop: function ()
 119    {
 120        clearTimeout(__myself.statTimer);
 121        clearTimeout(__myself.showTimer);
 122        clearTimeout(__myself.termTimer);
 123        clearTimeout(__myself.bytargetTimer);
 124     },
 125
 126     reset: function ()
 127     {
 128         __myself.sessionID = null;
 129         __myself.initStatusOK = false;
 130         __myself.pingStatusOK = false;
 131         __myself.searchStatusOK = false;
 132
 133         __myself.stop();
 134
 135         if ( __myself.resetCallback )
 136                 __myself.resetCallback();
 137     },
 138     init: function ( sessionId )
 139     {
 140         __myself.reset();
 141
 142         if ( sessionId != undefined ) {
 143             __myself.initStatusOK = true;
 144             __myself.sessionID = sessionId;
 145             __myself.ping();
 146         } else if (__myself.useSessions) {
 147             var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 148             request.get(
 149                 [ { "command": "init" } ],
 150                 function(data) {
 151                     if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 152                         if ( data.getElementsByTagName("protocol")[0].childNodes[0].nodeValue != __myself.suppProtoVer )
 153                             throw new Error("Server's protocol not supported by the client");
 154                         __myself.initStatusOK = true;
 155                         __myself.sessionID = data.getElementsByTagName("session")[0].childNodes[0].nodeValue;
 156                         setTimeout("__myself.ping()", __myself.keepAlive);
 157                     }
 158                     else
 159                         // if it gets here the http return code was 200 (pz2 errors are 417)
 160                         // but the response was invalid, it should never occur
 161                         setTimeout("__myself.init()", 1000);
 162                 }
 163             );
 164         } else {
 165             __myself.initStatusOK = true;
 166         }
 167     },
 168     // no need to ping explicitly
 169     ping: function ()
 170     {
 171         if( !__myself.initStatusOK )
 172             return;
 173             // session is not initialized code here
 174         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 175         request.get(
 176             [ { "command": "ping", "session": __myself.sessionID } ],
 177             function(data) {
 178                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 179                     __myself.pingStatusOK = true;
 180                     setTimeout("__myself.ping()", __myself.keepAlive);
 181                 }
 182                 else
 183                     // if it gets here the http return code was 200 (pz2 errors are 417)
 184                     // but the response was invalid, it should never occur
 185                     setTimeout("__myself.ping()", 1000);
 186             }
 187         );
 188     },
 189     search: function (query, num, sort, filter)
 190     {
 191         clearTimeout(__myself.statTimer);
 192         clearTimeout(__myself.showTimer);
 193         clearTimeout(__myself.termTimer);
 194         clearTimeout(__myself.bytargetTimer);
 195
 196         __myself.showCounter = 0;
 197         __myself.termCounter = 0;
 198         __myself.bytargetCounter = 0;
 199         __myself.statCounter = 0;
 200
 201         if( !__myself.initStatusOK )
 202             return;
 203
 204         if( query !== undefined )
 205             __myself.currQuery = query;
 206         else
 207             throw new Error("You need to supply query to the search command");
 208
 209         var searchParams = [{ "command": "search", "query": __myself.currQuery }];
 210         searchParams.push({"session":__myself.sessionID});
 211         if (filter !== undefined)
 212             searchParams.push({"filter": filter});
 213         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 214         request.get(
 215             searchParams,
 216             function(data) {
 217                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 218                     __myself.searchStatusOK = true;
 219                     //piggyback search
 220                     __myself.show(0, num, sort);
 221                     if ( __myself.statCallback )
 222                         __myself.stat();
 223                         //__myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
 224                     if ( __myself.termlistCallback )
 225                         __myself.termlist();
 226                         //__myself.termTimer = setTimeout("__myself.termlist()", __myself.termTime / 4);
 227                     if ( __myself.bytargetCallback )
 228                         __myself.bytarget();
 229                         //__myself.bytargetTimer = setTimeout("__myself.bytarget()", __myself.bytargetTime / 4);
 230                 }
 231                 else
 232                     // if it gets here the http return code was 200 (pz2 errors are 417)
 233                     // but the response was invalid, it should never occur
 234                     setTimeout("__myself.search(__myself.currQuery)", 500);
 235             }
 236         );
 237     },
 238     stat: function()
 239     {
 240         if( !__myself.initStatusOK )
 241             return;
 242         // if called explicitly takes precedence
 243         clearTimeout(__myself.statTimer);
 244         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 245         request.get(
 246             [ { "command": "stat", "session": __myself.sessionID } ],
 247             function(data) {
 248                 if ( data.getElementsByTagName("stat") ) {
 249                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 250                     __myself.activeClients = activeClients;
 251                     var stat = {
 252                     "activeclients": activeClients,
 253                     "hits": Number( data.getElementsByTagName("hits")[0].childNodes[0].nodeValue ),
 254                     "records": Number( data.getElementsByTagName("records")[0].childNodes[0].nodeValue ),
 255                     "clients": Number( data.getElementsByTagName("clients")[0].childNodes[0].nodeValue ),
 256                     "initializing": Number( data.getElementsByTagName("initializing")[0].childNodes[0].nodeValue ),
 257                     "searching": Number( data.getElementsByTagName("searching")[0].childNodes[0].nodeValue ),
 258                     "presenting": Number( data.getElementsByTagName("presenting")[0].childNodes[0].nodeValue ),
 259                     "idle": Number( data.getElementsByTagName("idle")[0].childNodes[0].nodeValue ),
 260                     "failed": Number( data.getElementsByTagName("failed")[0].childNodes[0].nodeValue ),
 261                     "error": Number( data.getElementsByTagName("error")[0].childNodes[0].nodeValue )
 262                     };
 263
 264                     __myself.statCounter++;
 265                     var delay = __myself.statTime + __myself.statCounter * __myself.dumpFactor;
 266                     if ( activeClients > 0 )
 267                         __myself.statTimer = setTimeout("__myself.stat()", delay);
 268
 269                     __myself.statCallback(stat);
 270                 }
 271                 else
 272                     // if it gets here the http return code was 200 (pz2 errors are 417)
 273                     // but the response was invalid, it should never occur
 274                     __myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
 275             }
 276         );
 277     },
 278     show: function(start, num, sort)
 279     {
 280         if( !__myself.searchStatusOK )
 281             return;
 282         // if called explicitly takes precedence
 283         clearTimeout(__myself.showTimer);
 284
 285         if( sort !== undefined )
 286             __myself.currentSort = sort;
 287         if( start !== undefined )
 288             __myself.currentStart = Number( start );
 289         if( num !== undefined )
 290             __myself.currentNum = Number( num );
 291         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 292         var context = this;
 293         request.get(
 294             [ { "command": "show", "session": __myself.sessionID, "start": __myself.currentStart,
 295               "num": __myself.currentNum, "sort": __myself.currentSort, "block": 1 } ],
 296             function(data) {
 297                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 298                     // first parse the status data send along with records
 299                     // this is strictly bound to the format
 300                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 301                     __myself.activeClients = activeClients;
 302                     var show = {
 303                     "activeclients": activeClients,
 304                     "merged": Number( data.getElementsByTagName("merged")[0].childNodes[0].nodeValue ),
 305                     "total": Number( data.getElementsByTagName("total")[0].childNodes[0].nodeValue ),
 306                     "start": Number( data.getElementsByTagName("start")[0].childNodes[0].nodeValue ),
 307                     "num": Number( data.getElementsByTagName("num")[0].childNodes[0].nodeValue ),
 308                     "hits": []
 309                     };
 310                     // parse all the first-level nodes for all <hit> tags
 311                     var hits = data.getElementsByTagName("hit");
 312                     var hit = new Array();
 313                     for (i = 0; i < hits.length; i++) {
 314                         show.hits[i] = new Array();
 315                         show.hits[i]['location'] = new Array();
 316                         for ( j = 0; j < hits[i].childNodes.length; j++) {
 317                             var locCount = 0;
 318                             if ( hits[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 319                                 if (hits[i].childNodes[j].nodeName == 'location') {
 320                                     var locNode = hits[i].childNodes[j];
 321                                     var id = locNode.getAttribute('id');
 322                                     show.hits[i]['location'][id] = {
 323                                         "id": locNode.getAttribute("id"),
 324                                         "name": locNode.getAttribute("name")
 325                                     };
 326                                 }
 327                                 else {
 328                                     var nodeName = hits[i].childNodes[j].nodeName;
 329                                     var nodeText = 'ERROR'
 330                                     if ( hits[i].childNodes[j].firstChild )
 331                                         nodeText = hits[i].childNodes[j].firstChild.nodeValue;
 332                                     show.hits[i][nodeName] = nodeText;
 333                                 }
 334                             }
 335                         }
 336                     }
 337                     __myself.showCounter++;
 338                     var delay = __myself.showTime;
 339                     if (__myself.showCounter > __myself.showFastCount)
 340                             delay += __myself.showCounter * __myself.dumpFactor;
 341                     if ( activeClients > 0 )
 342                         __myself.showTimer = setTimeout("__myself.show()", delay);
 343
 344                     __myself.showCallback(show);
 345                 }
 346                 else
 347                     // if it gets here the http return code was 200 (pz2 errors are 417)
 348                     // but the response was invalid, it should never occur
 349                     __myself.showTimer = setTimeout("__myself.show()", __myself.showTime / 4);
 350             }
 351         );
 352     },
 353     record: function(id)
 354     {
 355         if( !__myself.searchStatusOK )
 356             return;
 357
 358         if( id !== undefined )
 359             __myself.currRecID = id;
 360         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 361         request.get(
 362             [ { "command": "record", "session": __myself.sessionID, "id": __myself.currRecID } ],
 363             function(data) {
 364                 var recordNode;
 365                 var record = new Array();
 366                 if ( recordNode = data.getElementsByTagName("record")[0] ) {
 367                     // if stylesheet was fetched do not parse the response
 368                     if ( __myself.xslDoc ) {
 369                         record['recid'] = recordNode.getElementsByTagName("recid")[0].firstChild.nodeValue;
 370                         record['xmlDoc'] = data;
 371                         record['xslDoc'] = __myself.xslDoc;
 372                     } else {
 373                         for ( i = 0; i < recordNode.childNodes.length; i++) {
 374                             if ( recordNode.childNodes[i].nodeType == Node.ELEMENT_NODE
 375                                     && recordNode.childNodes[i].nodeName != 'location' ) {
 376                                 var nodeName = recordNode.childNodes[i].nodeName;
 377                                 var nodeText = recordNode.childNodes[i].firstChild.nodeValue;
 378                                 record[nodeName] = nodeText;
 379                             }
 380                         }
 381                         // the location might be empty!!
 382                         var locationNodes = recordNode.getElementsByTagName("location");
 383                         record["location"] = new Array();
 384                         for ( i = 0; i < locationNodes.length; i++ ) {
 385                             record["location"][i] = {
 386                                 "id": locationNodes[i].getAttribute("id"),
 387                                 "name": locationNodes[i].getAttribute("name")
 388                             };
 389
 390                             for ( j = 0; j < locationNodes[i].childNodes.length; j++) {
 391                                 if ( locationNodes[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 392                                     var nodeName = locationNodes[i].childNodes[j].nodeName;
 393                                     var nodeText = '';
 394                                     if (locationNodes[i].childNodes[j].firstChild)
 395                                             nodeText = locationNodes[i].childNodes[j].firstChild.nodeValue;
 396                                     record["location"][i][nodeName] = nodeText;
 397                                 }
 398                             }
 399                         }
 400                     }
 401
 402                     __myself.recordCallback(record);
 403                 }
 404                 else
 405                     // if it gets here the http return code was 200 (pz2 errors are 417)
 406                     // but the response was invalid, it should never occur
 407                     setTimeout("__myself.record(__myself.currRecID)", 500);
 408             }
 409         );
 410     },
 411     termlist: function()
 412     {
 413         if( !__myself.searchStatusOK )
 414             return;
 415         // if called explicitly takes precedence
 416         clearTimeout(__myself.termTimer);
 417         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 418         request.get(
 419             [ { "command": "termlist", "session": __myself.sessionID, "name": __myself.termKeys } ],
 420             function(data) {
 421                 if ( data.getElementsByTagName("termlist") ) {
 422                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 423                     __myself.activeClients = activeClients;
 424                     var termList = { "activeclients":  activeClients };
 425                     var termLists = data.getElementsByTagName("list");
 426                     //for each termlist
 427                     for (i = 0; i < termLists.length; i++) {
 428                         var listName = termLists[i].getAttribute('name');
 429                         termList[listName] = new Array();
 430                         var terms = termLists[i].getElementsByTagName('term');
 431                         //for each term in the list
 432                         for (j = 0; j < terms.length; j++) {
 433                             var term = {
 434                                 "name": (terms[j].getElementsByTagName("name")[0].childNodes.length
 435                                                 ? terms[j].getElementsByTagName("name")[0].childNodes[0].nodeValue
 436                                                 : 'ERROR'),
 437                                 "freq": terms[j].getElementsByTagName("frequency")[0].childNodes[0].nodeValue || 'ERROR'
 438                             };
 439
 440                             var termIdNode = terms[j].getElementsByTagName("id");
 441                             if(terms[j].getElementsByTagName("id").length)
 442                                 term["id"] = termIdNode[0].childNodes[0].nodeValue;
 443
 444                             termList[listName][j] = term;
 445                         }
 446                     }
 447
 448                     __myself.termCounter++;
 449                     var delay = __myself.termTime + __myself.termCounter * __myself.dumpFactor;
 450                     if ( activeClients > 0 )
 451                         __myself.termTimer = setTimeout("__myself.termlist()", delay);
 452
 453                    __myself.termlistCallback(termList);
 454                 }
 455                 else
 456                     // if it gets here the http return code was 200 (pz2 errors are 417)
 457                     // but the response was invalid, it should never occur
 458                     __myself.termTimer = setTimeout("__myself.termlist()", __myself.termTime / 4);
 459             }
 460         );
 461
 462     },
 463     bytarget: function()
 464     {
 465         if( !__myself.searchStatusOK )
 466             return;
 467         // if called explicitly takes precedence
 468         clearTimeout(__myself.bytargetTimer);
 469         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 470         request.get(
 471             [ { "command": "bytarget", "session": __myself.sessionID } ],
 472             function(data) {
 473                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 474                     var targetNodes = data.getElementsByTagName("target");
 475                     var bytarget = new Array();
 476                     for ( i = 0; i < targetNodes.length; i++) {
 477                         bytarget[i] = new Array();
 478                         for( j = 0; j < targetNodes[i].childNodes.length; j++ ) {
 479                             if ( targetNodes[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 480                                 var nodeName = targetNodes[i].childNodes[j].nodeName;
 481                                 var nodeText = targetNodes[i].childNodes[j].firstChild.nodeValue;
 482                                 bytarget[i][nodeName] = nodeText;
 483                             }
 484                         }
 485                     }
 486
 487                     __myself.bytargetCounter++;
 488                     var delay = __myself.bytargetTime + __myself.bytargetCounter * __myself.dumpFactor;
 489                     if ( __myself.activeClients > 0 )
 490                         __myself.bytargetTimer = setTimeout("__myself.bytarget()", delay);
 491
 492                     __myself.bytargetCallback(bytarget);
 493                 }
 494                 else
 495                     // if it gets here the http return code was 200 (pz2 errors are 417)
 496                     // but the response was invalid, it should never occur
 497                     __myself.bytargetTimer = setTimeout("__myself.bytarget()", __myself.bytargetTime / 4);
 498             }
 499         );
 500     },
 501     // just for testing, probably shouldn't be here
 502     showNext: function(page)
 503     {
 504         var step = page || 1;
 505         __myself.show( ( step * __myself.currentNum ) + __myself.currentStart );
 506     },
 507     showPrev: function(page)
 508     {
 509         if (__myself.currentStart == 0 )
 510             return false;
 511         var step = page || 1;
 512         var newStart = __myself.currentStart - (step * __myself.currentNum );
 513         __myself.show( newStart > 0 ? newStart : 0 );
 514     },
 515     showPage: function(pageNum)
 516     {
 517         //var page = pageNum || 1;
 518         __myself.show(pageNum * __myself.currentNum);
 519     }
 520 };
 521
 522 /*
 523 *********************************************************************************
 524 ** AJAX HELPER CLASS ************************************************************
 525 *********************************************************************************
 526 */
 527 var pzHttpRequest = function ( url, errorHandler ) {
 528         this.request = null;
 529         this.url = url;
 530         this.errorHandler = errorHandler || null;
 531         this.async = true;
 532
 533         if ( window.XMLHttpRequest ) {
 534             this.request = new XMLHttpRequest();
 535         } else if ( window.ActiveXObject ) {
 536             try {
 537                 this.request = new ActiveXObject( 'Msxml2.XMLHTTP' );
 538             } catch (err) {
 539                 this.request = new ActiveXObject( 'Microsoft.XMLHTTP' );
 540             }
 541         }
 542 };
 543
 544 pzHttpRequest.prototype =
 545 {
 546     get: function ( params, callback )
 547     {
 548         this._send( 'GET', params, null, callback );
 549     },
 550
 551     post: function ( params, data, callback )
 552     {
 553         this._send( 'POST', params, data, callback );
 554     },
 555
 556     _send: function ( type, params, data, callback )
 557     {
 558         this.callback = callback;
 559         var context = this;
 560         this.request.open( type, this._urlAppendParams(params), this.async );
 561         //this.request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
 562         this.request.onreadystatechange = function () {
 563             context._handleResponse();
 564         }
 565         this.request.send(data);
 566     },
 567
 568     _urlAppendParams: function (params)
 569     {
 570         var getUrl = this.url;
 571
 572         var sep = '?';
 573         for (var i = 0; i < params.length; i++) {
 574             var el = params[i];
 575             for (var key in el) {
 576                 if (el[key] != null) {
 577                     getUrl += sep + key + '=' + encodeURI(el[key]);
 578                     sep = '&';
 579                 }
 580             }
 581         }
 582         return getUrl;
 583     },
 584
 585     _handleResponse: function ()
 586     {
 587         if ( this.request.readyState == 4 ) {
 588             if ( this.request.status == 200 ) {
 589                 this.callback( this.request.responseXML );
 590             }
 591             // pz errors
 592             else if ( this.request.status == 417 ) {
 593                 var errMsg = this.request.responseXML.getElementsByTagName("error")[0].childNodes[0].nodeValue;
 594                 var errCode = this.request.responseXML.getElementsByTagName("error")[0].getAttribute("code");
 595
 596                 var err = new Error(errMsg);
 597                 err.code = errCode;
 598
 599                 if (this.errorHandler) {
 600                     this.errorHandler(err);
 601                 }
 602                 else {
 603                     throw err;
 604                 }
 605             }
 606             else {
 607                 var err = new Error("XMLHttpRequest error. STATUS: "
 608                             + this.request.status + " STATUS TEXT: "
 609                             + this.request.statusText );
 610                 err.code = 'HTTP';
 611
 612                 if (this.errorHandler) {
 613                     this.errorHandler(err);
 614                 }
 615                 else {
 616                     throw err;
 617                 }
 618             }
 619         }
 620     }
 621 };
 622
 623 /*
 624 *********************************************************************************
 625 ** QUERY CLASS ******************************************************************
 626 *********************************************************************************
 627 */
 628 var pzQuery = function()
 629 {
 630     this.simpleQuery = '';
 631     this.singleFilter = null;
 632     this.advTerms = new Array();
 633     this.filterHash = new Array();
 634     this.numTerms = 0;
 635     this.filterNums = 0;
 636 };
 637 pzQuery.prototype = {
 638     reset: function()
 639     {
 640         this.simpleQuery = '';
 641         this.advTerms = new Array();
 642         this.simpleFilter = null;
 643         this.numTerms = 0;
 644     },
 645     clearSimpleQuery: function()
 646     {
 647         this.simpleQuery = '';
 648     },
 649     addTerm: function(field, value)
 650     {
 651         var term = {"field": field, "value": value};
 652         this.advTerms[this.numTerms] = term;
 653         this.numTerms++;
 654     },
 655     getTermValueByIdx: function(index)
 656     {
 657         return this.advTerms[index].value;
 658     },
 659     getTermFieldByIdx: function(index)
 660     {
 661         return this.advTerms[index].field;
 662     },
 663     /* semicolon separated list of terms for given field*/
 664     getTermsByField: function(field)
 665     {
 666         var terms = '';
 667         for(var i = 0; i < this.advTerms.length; i++)
 668         {
 669             if( this.advTerms[i].field == field )
 670                 terms = terms + this.queryHas[i].value + ';';
 671         }
 672         return terms;
 673     },
 674     addTermsFromList: function(inputString, field)
 675     {
 676         var inputArr = inputString.split(';');
 677         for(var i=0; i < inputArr.length; i++)
 678         {
 679             if(inputArr[i].length < 3) continue;
 680             this.advTerms[this.numTerms] = {"field": field, "value": inputArr[i] };
 681             this.numTerms++;
 682         }
 683     },
 684     removeTermByIdx: function(index)
 685     {
 686         this.advTerms.splice(index, 1);
 687         this.numTerms--;
 688     },
 689     toCCL: function()
 690     {
 691         var ccl = '';
 692         if( this.simpleQuery != '')
 693             ccl = this.simpleQuery;
 694         for(var i = 0; i < this.advTerms.length; i++)
 695         {
 696             if (ccl != '') ccl = ccl + ' and ';
 697             ccl = ccl + this.advTerms[i].field+'="'+this.advTerms[i].value+'"';
 698         }
 699         return ccl;
 700     },
 701     addFilter: function(name, value)
 702     {
 703         var filter = {"name": name, "id": value };
 704         this.filterHash[this.filterHash.length] = filter;
 705         this.filterNums++
 706         return  this.filterHash.length - 1;
 707     },
 708     setFilter: function(name, value)
 709     {
 710         this.filterHash = new Array();
 711         this.filterNums = 0;
 712         this.addFilter(name, value);
 713     },
 714     getFilter: function(index)
 715     {
 716         return this.filterHash[index].id;
 717     },
 718     getFilterName: function(index)
 719     {
 720         return this.filterHash[index].name;
 721     },
 722     removeFilter: function(index)
 723     {
 724         delete this.filterHash[index];
 725         this.filterNums--;
 726     },
 727     clearFilter: function()
 728     {
 729         this.filterHash = new Array();
 730         this.filterNums = 0;
 731     },
 732     getFilterString: function()
 733     {
 734         //temporary
 735         if( this.singleFilter != null ) {
 736             return 'pz:id='+this.singleFilter.id;
 737         }
 738         else if( this.filterNums <= 0 ) {
 739             return undefined;
 740         }
 741
 742         var filter = 'pz:id=';
 743         for(var i = 0; i < this.filterHash.length; i++)
 744         {
 745             if (this.filterHash[i] == undefined) continue;
 746             if (filter > 'pz:id=') filter = filter + '|';
 747             filter += this.filterHash[i].id;
 748         }
 749         return filter;
 750     },
 751     totalLength: function()
 752     {
 753         var simpleLength = this.simpleQuery != '' ? 1 : 0;
 754         return this.advTerms.length + simpleLength;
 755     },
 756     clearSingleFilter: function()
 757     {
 758         this.singleFilter = null;
 759     },
 760     setSingleFilter: function(name, value)
 761     {
 762         this.singleFilter = {"name": name, "id": value };
 763     },
 764     getSingleFilterName: function()
 765     {
 766         return this.singleFilter.name;
 767     }
 768 }
 769
 770 }